Code Review

This pull request reverts the temporary removal of NPM integration tests and includes a fix to make them work in the GitHub Actions environment by forcing the CI environment variable to false. The changes look good and correctly address the issue with interactive tests in CI. I have one suggestion to improve the CI workflow's reliability.

Tried to dig up more info on this and found some interesting things but not a lot of concrete sources XD

https://github.blog/changelog/2020-04-15-github-actions-sets-the-ci-environment-variable-to-true/ <-- github actions is doing this on purpose, tho there's very little information there

the AI summaries for my searches assert repeatedly that CI=true will change npm behavior but sources are hard to come by, https://stackoverflow.com/questions/62473327/how-does-ci-true-affect-the-npm-install-command seems like the best

I'm wondering if CI=true is such a standard that github actions is asserting it by default, if we're going to have other side effects we don't want from explicitly disabling this 🤔 some of the failures on this PR seem like they could be related:

 FAIL  file-system-interactive.test.ts > Interactive file system > should perform a read-then-write sequence
AssertionError: CLI did not start up in interactive mode correctly: expected false to be true // Object.is equality

- Expected
+ Received

- true
+ false

 ❯ file-system-interactive.test.ts:45:9
     43|         isReady,
     44|         'CLI did not start up in interactive mode correctly',
     45|       ).toBe(true);
       |         ^
     46| 
     47|       // Step 1: Read the file

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Ugh, even more flakes! Well anyway this one looks good!

I don't think I have permission to approve workflow changes unfortunately but ill see what happens if i try XD